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Stable Tsai-type quinary 1/1 and 2/1 approximant crystals (ACs) with chemicalcompositions Au56.25Al10Cu7In13Tb13.75 and Au55.5Al10Cu7In13Tb14.5,respectively, exhibiting ferromagnetic (FM) long-range orders were successfullysynthesized and studied for their magnetic properties and magnetocaloriceffect. The 1/1 and 2/1 ACs primarily differ in their long-range atomicarrangement and rare earth (RE) distribution, with the latter approachingquasiperiodic order while still preserving periodicity. Analyses based on thescaling principle and Kouvel-Fisher (KF) relations suggested mean-field-likebehavior near Curie temperatures in both compounds. From magnetizationmeasurements and the Maxwell equation, a magnetic entropy change of -4.3 and-4.1 J/K mol Tb were derived under a magnetic field change of 7 T for the 1/1and 2/1 ACs, respectively. The results indicated a prominent role ofintra-cluster magnetic interactions on critical behavior and magnetic entropyof the Tsai-type compounds.

Critical behavior and magnetocaloric effect in Tsai-type 2/1 and 1/1 quasicrystal approximants